Gaze tracking for field analyzer
US5220361A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 5, 1991 |
| Grant date | Jun 15, 1993 |
| Priority date | — |
| Expiry date | Jun 5, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C13/005
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A field test apparatus is disclosed which is interactive both in the automated positioning of trial lenses (used to correct the patient's focal distance to the tester hemispherical projection screen) as well as providing automatic gaze direction determination through automated video surveillance of the patient's eye. A moveable trial lens holder is provided. This trial lens holder is remotely moveable horizontally and vertically and carries light sources for illuminating the eye preferably in the infrared spectrum at oblique angles preferably towards the center of the eye from the periphery of the trial lens holder. In the gaze direction determination system, a gaze direction determination infrared source--preferably on the surface of the screen near the center of the screen--generates a gaze direction determination reflection on the cornea of the eye--this reflection being near the apex of a normal spherical cornea. At the same time, provision for the automated video measurement of the center of the eye pupil is provided--preferably including measuring a horizontal chord of the eye pupil, bisecting this horizontal chord, locating the bottom of the eye pupil along the bisected dime…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.